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git-authenticate: Ensure the target is a descendant of the introductory commit.

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Fixes a bug whereby authentication of a commit *not* descending from the
introductory commit could succeed, provided the commit verifies the
authorization invariant.

In the example below, A is a common ancestor of the introductory commit
I and of commit X.  Authentication of X would succeed, even though it is
not a descendant of I, as long as X is authorized according to the
'.guix-authorizations' in A:

   X   	 I
    \   /
      A

This is because, 'authenticate-repository' would not check whether X
descends from I, and the call (commit-difference X I) would return X.

In practice that only affects forks because it means that ancestors of
the introductory commit already contain a '.guix-authorizations' file.

* guix/git-authenticate.scm (authenticate-repository): Add call to
'commit-descendant?'.
* tests/channels.scm ("authenticate-channel, not a descendant of introductory commit"):
New test.
* tests/git-authenticate.scm ("authenticate-repository, target not a descendant of intro"):
New test.
* tests/guix-git-authenticate.sh: Expect earlier test to fail since
9549f0283a is not a descendant of
$intro_commit.  Add new test targeting an ancestor of the introductory
commit, and another test targeting the v1.2.0 commit.
* doc/guix.texi (Specifying Channel Authorizations): Add a sentence.
This commit is contained in:
Ludovic Courtès
2022-01-28 17:20:43 +01:00
parent 87d49346f3
commit ca87601dd9
5 changed files with 136 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
tests/guix-git-authenticate.sh
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@@ -1,5 +1,5 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2020, 2022 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
@@ -34,10 +34,18 @@ intro_signer="BBB0 2DDF 2CEA F6A8 0D1D E643 A2A0 6DF2 A33A 54FA"
cache_key="test-$$"
guix git authenticate "$intro_commit" "$intro_signer" \
# This must fail because the end commit is not a descendant of $intro_commit.
! guix git authenticate "$intro_commit" "$intro_signer" \
--cache-key="$cache_key" --stats \
--end=9549f0283a78fe36f2d4ff2a04ef8ad6b0c02604
# The v1.2.0 commit is a descendant of $intro_commit and it satisfies the
# authorization invariant.
v1_2_0_commit="a099685659b4bfa6b3218f84953cbb7ff9e88063"
guix git authenticate "$intro_commit" "$intro_signer" \
--cache-key="$cache_key" --stats \
--end="$v1_2_0_commit"
rm "$XDG_CACHE_HOME/guix/authentication/$cache_key"
# Commit and signer of the 'v1.0.0' tag.
@@ -45,6 +53,11 @@ v1_0_0_commit="6298c3ffd9654d3231a6f25390b056483e8f407c"
v1_0_0_signer="3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5" # civodul
v1_0_1_commit="d68de958b60426798ed62797ff7c96c327a672ac"
# This should succeed because v1.0.0 is an ancestor of $intro_commit.
guix git authenticate "$intro_commit" "$intro_signer" \
--cache-key="$cache_key" --stats \
--end="$v1_0_0_commit"
# This should fail because these commits lack '.guix-authorizations'.
! guix git authenticate "$v1_0_0_commit" "$v1_0_0_signer" \
--cache-key="$cache_key" --end="$v1_0_1_commit"